Friday, April 3, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 3, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A WET, COOL, WINDY DAY…

A fairly bleak Friday atop the hill. Temperatures have
hovered in the low-40s for much of the day with a busy
north-northeast wind peaking so far at 51 MPH. Rain fell
during the overnight hours yielding 1.07 ins of needed
precipitation by 7AM. It has persisted throughout the day
tacking on another 0.50 ins by 1 PM.  Visibility has
remained 1/2 mile or less at any time.

Our high temperature so far today is 42F, which is 9 degrees
below our daily normal high temperature of 51F. The low
since midnight is 38F, which is 5 degrees above the daily
normal low of 33F.

PRELIMINARY STATS FOR MARCH 2020

TEMPERATURE, Deg. F
Avg. Max. 49.8 [+5.5] Avg. Min. 32.3 [+5.7] Mean      41.4 [+5.9] 24-hour corrected mean: 40.5
Max. for month: 72F on the 9th
Min. for month: 15F on the 1st

HEATING DEGREE DAYS
Total heating units:    733 [-183] Total for the season:  4873 [-611] Total for last season: 5432

PRECIPITATION, Inches
Total: 4.67 [-0.91] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 2.8 [-9.9] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 12.6 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   W [12%] Peak gust and direction:     56 W on the 4th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Vertical visibility 300 ft, sky obscured, moderate rain
Temperature: 42F; Dew Point: 42F; Relative Humidity: 100%
Wind: N at 15G27 kts
Peak wind: 32 MPH (27 kts) N at 6:20 A.M.
Sea-level pressure: 29.49 ins. Hg: rising, then rising more rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 42F
6-hr Min temp: 38F
24-hr Precip:  1.07 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 X W3 1/2RF 988/42/42/3515G27/949/ RCTD
PK WND 3527/20/ 8//// 53019 70107 10042 20038

10 A.M.
Weather: Vertical visibility 300 ft, sky obscured, light rain
Temperature: 42F; Dew Point: 42F; Relative Humidity: 100%
Wind: NNE at 22G35 kts
Peak Wind: 43 MPH (37 kts) NNE at 8:38 A.M.
Sea-level pressure: 29.56 ins. Hg: rising, then rising more rapidly
Visibility: 1/4 mile, fog
3-hr Precip:  0.27 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W3 1/4R-F 001/42/42/0322G35/956/ R-CTD
PK WND 0337/1338/ 8//// 60027 53022

1 P.M.
Weather: Vertical visibility 300 ft, sky obscured, light rain
Temperature: 42F; Dew Point: 42F; Relative Humidity: 100%
Wind: NNE at 15G35 kts,
Peak Wind: 51 MPH (44 kts) NNE at 11:39 A.M.
Sea-level pressure: 29.62 ins. Hg: rising, then rising more rapidly
Visibility: 1/8 miles, fog
6-hr Max temp: 42F
6-hr Min temp: 42F
6-hr Precip:  0.50 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 X W3 1/8R-F 032/42/42/0215G35/962/
R-CTD PK WND 0244/1639/ 8//// 6050 53022 10042 20042

SUMMARY FOR THURSDAY, APRIL 2, 2020

TEMPERATURE (DEGREES F)
MAX…..46   NORMAL…..50
MIN…..35   NORMAL…..33
MEAN….41   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL………………+/-0
TOTAL DEPARTURE FOR THE MONTH………………..-6 [-3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………24  DEPARTURE……+/-0
TOTAL HEATING UNITS FOR THE MONTH……………54  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE SEASON…………4927  DEPARTURE……-605
TOTAL HEATING UNITS LAST SEASON TO DATE…….5458  DEPARTURE……-531

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..39 NW  AT  2:55 P.M.
AERO…………………….40 NW  AT  2:34 P.M
ASOS…………………….40 NW  AT  2:54 P.M.
DAVIS……………………39 NW  AT  4:06 P.M. RMY 41
FASTEST MILE FOR YESTERDAY………………….28 NW  AT  1:51 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  AT  2:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………28 NW  AT  1:51 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.3 NW
ASOS…………………..16.7
DAVIS………………….16.9 NW [326 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.07  DEPARTURE……+0.90
ASOS…………..1.01
TOTAL PRECIPITATION FOR THE MONTH……….1.12  DEPARTURE……+0.78
ASOS…………..1.05
TOTAL PRECIPITATION FOR THE YEAR……….10.45  DEPARTURE……-3.89
ASOS………….10.78

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.2
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE SEASON…………..27.6  DEPARTURE……-32.5

PRELIMINARY CLIMATE SUMMARY FOR MARCH CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

03/01  33/15/24/-7/0.00/0.0/676/100        28 WNW AERO 28 WNW RMY 27
03/02  52/24/38/+7/T/T/482/71              40 S   AERO 39 S   RMY 41
03/03  64/45/55/+23/…./0.0/361/53        30 S   AERO 30 S   RMY N/A
03/04  50/38/44/+12/…./0.0/561/82        56 W   AERO 56 W   RMY 58
03/05  51/32/42/+10/0.00/0.0/666/97        31 W   AERO 31 NW  RMY 32
03/06  47/30/39/+7/…./…/283/41         46 NE  AERO 45 NE  RMY 46
03/07  43/26/35/+2/…./…/534/77         42 N   AERO 43 N   RMY 44
03/08  53/26/40/+7/0.00/0.0/508/73         31 W   AERO 30 W   RMY 28
03/09  72/40/56/+23/0.00/0.0/685/98        32 SW  AERO 32 SW  RMY 31
03/10  68/49/59/+26/0.00/0.0/246/35        48 WSW AERO 46 WSW RMY 49
03/11  56/37/47/+13/0.00/0.0/501/71        31 WNW AERO M  M   RMY 21
03/12  46/31/39/+5/…./0.0/156/22         21 SE  AERO 18 SE  RMY N/A
03/13  59/38/49/+15/…./0.0/000/00        46 WNW AERO 44 WNW RMY 46
03/14  51/35/43/+8/0.00/0.0/613/86         37 W   AERO 36 W   RMY 35
03/15  47/28/38/+3/0.00/0.0/680/95         28 NW  AERO 28 NW  RMY N/A
03/16  36/22/29/-6/0.00/0.0/618/86         21 NE  AERO 21 ESE RMY 21
03/17  43/28/36/0/…./0.4/000/00          29 W   AERO 30 W   RMY 29
03/18  54/31/43/+7/…./0.0/609/84         26 S   AERO 26 S   RMY 26
03/19  43/37/40/+4/…./0.0/000/00         36 E   AERO 35 E   RMY 34
03/20  66/37/52/+15/…./0.0/000/00        48 W   AERO 48 W   RMY 46
03/21  55/29/42/+5/0.00/0.0/535/73         45 W   AERO 48 W   RMY N/A
03/22  36/23/30/-7/0.00/0.0/692/94         23 NE  AERO 24 NE  RMY 23
03/23  40/25/33/-5/…./1.6/037/05         38 NNE AERO 39 NNE RMY 38
03/24  48/33/41/+3/…./…/148/20         37 NNW AERO 37 NNW RMY N/A
03/25  41/35/38/0/0.03/0.0/000/00          28 ENE AERO 28 ENE RMY 27
03/26  51/30/41/+2/…./0.0/613/82         25 SSE AERO 26 SSW RMY N/A
03/27  61/41/51/+12/…./0.0/…/..        32 NW  AERO M  M   RMY 33
03/28  56/36/46/+7/…./0.0/…/..         22 S   AERO 21 E   RMY N/A
03/29  43/37/40/0/…./0.0/…/..          32 NE  AERO 33 NE  RMY 33
03/30  40/34/37/-3/…./0.0/…/..         33 NE  AERO 33 NE  RMY 33
03/31  40/29/35/-6/…./0.0/…/..         28 ENE AERO 26 ENE RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

04/01  42/28/35/-6/0.00/0.0/…/..         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/…/..           39 NW  AER0 40 NW  RMY 41

04/03 The low since midnight is 38F, daily normal minimum is 33F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Andrew Swanson